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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '59865bc0c20b76d38394e57fd865fb7bdb44279f988aecb4b74e730cae74e480' 
  AND token = '4W8N7cmypVR9UeV5AmJChKDeXUj6qKab4Ko90JXYgdQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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