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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'fe2bd05fa0732c1ad766ebd19ac732acfb2892e8b6b981f16fe8150b13fec322' 
  AND token = 'NtsEpQxEbUMGp4NkN7HaAAcvO4HC9+hGyEzy3oue7XM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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