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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '500ae6c70d84de85a88a638f2a566790f1e5a764ab17a4cbc28f025841b50464' 
  AND token = '8acr2oW1bb9tlcVUeWVyyT3Otrw1yOvq/pmmHy//emg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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