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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4579d7e4ad13693a2793385f530c9c9e5e9a9d8dc59a1090218a7f80b1e32c07' 
  AND token = 'dEhPAPoQmyAn0DQxdUmcsCJ8SGj2d1kL7UySAa4ySbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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