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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a7720b85dc48eaed8f2f7ac756ce2f089698927dcbce47a1b49d9b8e569b452c' 
  AND token = 'xkzwHEnFpR7WbaetBxes+Us3tiR4cqpxSj5HETR1/cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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