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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '73cdf5f245e498754c7b49d89be51a6386f7afc436cfbcacfbd8a0afa28706cc' 
  AND token = 'dwUWe/L9sjodHxUVL2jmaCc/P24Mb44Ti4V/Om3d+cU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00072

JSON explain

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