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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f451e23a0702c85c95d7b0a81335bff2d539aae494afb96d90d25ab84d990a8a' 
  AND token = '7l7dk7TPTdhZbdVHgqJ4RJx50oa45euFpKPSwPNP3YI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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