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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '1ba5cb019b31bd40daf659e00a1f92a7fddf2c023d744653ca2d3f173971be64' 
  AND token = 'YfPrbgiclJzrkbwwksFIrtNnD56Grc3QVJUU20ytokU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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