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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd414d8bc2c9113d1ae7d60697c34ba54ec578acf39e9298d66f2fe8735b097ef' 
  AND token = '7Ip629iDKpJZuN8FyEiT1Zyt+STi6Rodf9m4hly3jSc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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