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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '096f5a4001b03e800d7bc2dd28c79a870f592bd19cc53001e992dce9d891403e' 
  AND token = 'ZIv/4r6d2QtJL0WHCnhfMxrIFh777914kYHrMn9gkcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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