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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b7297c477d7d349d0e4a1260463112f5df2bc94c9c9fff2be4320804df0e26c9' 
  AND token = 'L6/Lmewtb4keXWsOIuqMqlcviFc3hcDlUhqQez4T8IM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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