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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '98f056386cd59d014304cf4c77d190b7cd6f6016c8574c610c445918cea9e4c3' 
  AND token = 'D4vdy9IYDZaE+vTfr+yVSfmCtzDeODpzzQGWbke83HM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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