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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '094b199a4f37ed5a043c78cc89177db1611aaf4ca741b6403e6cde1ae99a2d06' 
  AND token = '7pTHCs9P+H0jhOcPOK9fcaeJBJfk2uNmUejQAvoeMZQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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