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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5eb4e5499199c7ce65e92e655a94f7965c3d1255ae93e5fd561697ecf5871225' 
  AND token = 'QFfVFbF7hN2DA2jfGhnomymVwjUqUw12c4lj867NZbQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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