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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3f3e52a7bff6964749df70ca4f5b0ab01dd8ed3d4c5eb52820999ad79b220237' 
  AND token = '+CxqBy0MLJj5eFsrBAXYbGL5EQTRkATMIyMs6TXM+54=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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