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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cc691e754fd1fe4cc58afefceb2fb6b3e502f956b5bd7a1cf6c257bfdee762fc' 
  AND token = 'DP5XMDS2tTDriL/uYkNWxEIuiUdr3CF1uyTs5WLsUhg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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