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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '14afbe8a2fa362ffa66c1f3742096f623551d716fef0a67620685f365fbcb970' 
  AND token = '9oqeOsEUCMuMOJNlST3cef+Lh3QlwVStbbs4oa7bHPw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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