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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '60b946c79b43bd1bd541a8beff81c430defb736cef9cab55aa927cd6cf3abafd' 
  AND token = '17UtoCZr2xGclLeZvO7mf22tROGiLqR6a637Edukb4U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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