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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '31462c982e56200646be33d294158ce45e4e53a2232c75e7e23919d2a8445d2c' 
  AND token = 'wDLSkEFRHx5m/h+pMn5n/aiuQJTsxP5LZiPfcsCi8Oc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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