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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1fa8e3c99e682672777967c343f705a7f17e5ebf644a3346954042ced31bfb82' 
  AND token = 'ZgwbAkkmwW5Mmi0kEYrm9j4g/G4+L8yqn6ID0y4SS7s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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