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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'c20e387762e1a8d4ed43f7d1d7e78ef32c62958811100f43c71c018987727502' 
  AND token = 'XTsY9JWCVdfWxCMZFaRBnVnuiJ5sZ55w7eeIGsy9f68=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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