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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'aff5d9d44ddddff6fa904f2b0c661f4b3e3b9b303f7a97122a33b69f5d66ce72' 
  AND token = 'gj6e8SpJds7JcQ47m+z57qFDqNu7AwucAkupRE+KsX8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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