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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9a0b91ad1ab50501d0552287d5a84e4350206165736d3e237a4fdff65bfc060e' 
  AND token = 'QuVowNmVd2pOzngwbNv2roW+6rxu5KNt2C+WNAR16pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}