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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a10de687de17b2affc98e4a32b745d214a5c6e5ebad80dac68feb84bd40dbcef' 
  AND token = 'YKyWmgYspSpcALuB5agmsBHVG6BaNBZE5Qk0XXX+0ZU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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