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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '5fd74f30a2897dec693e3a6a4e793d2f5158648f20f1a7a24a545331a24d50f7' 
  AND token = 'NzAOGoiR9QMnb1xEEhP5tM2qBST38MrZTVEXfn9g85s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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