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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '6e8ed522203466935da4a5290c4bbb80f387fd40509d72e1b07a82e78e2b11b7' 
  AND token = 'KT8ZQ6v4dFdhS8qswhmjriAFfCamU3/TrncE7UyjR1Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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