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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b5f8e92b8b8429590dfda2f129f2a341c2d4370266d1e11a79d9544c4edf39fc' 
  AND token = 'uWGmAzoPlmPk2ipnyZ0b2DskCsaEpmR5sC8CU+0GUsA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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