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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '94381a8b8c4061ba4653edb2ab4538b6f45fc6ada94787b185dea617e7a4a2c7' 
  AND token = 'UN+xSqQlhAguk0qjEdcRUoQe+6X7Ca6Oav431FUP0NE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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