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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'd931956b4b4e9c9868a388e5252d85d9d07d19aecb9cb505fa2ab8649afcebae' 
  AND token = 'PZLxNjZtV69vA7tKZbULUx9ZMDayBU4SpqNWgp3PTps=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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