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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4c66c4a0cf6e6c53c14f3bf986c41c77abeaaf2d83f1aea7546fd3cc7c0cea33' 
  AND token = 'g81WINZQGsKtgrF/TE7NQsyd1O9u8z4i0R8VdtjsCC0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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