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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3c402eefdbdaae9d4ed6698678ec3430e36d6e67b8ce5bdaa2f6cf85066d0a11' 
  AND token = 'HwLuuzTk2uio1+IQiJclmmXnng86QtgF5TlDXcejTBw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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