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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '296b6687768a65aba95e80926b7886087b36f1997b707c280dfbcdac48c25dc3' 
  AND token = 'hL+X4s+QwrWf2vnZh3b3JAnAw+L89LbFv1VLiiJ2c+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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