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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'cf8ca61131d9d50f53b792451760fe03a53b0f4853c36a869bcd234ec075e025' 
  AND token = '6+lNXWdm/Ugwgydju0YtEgbnmApljm3jL29QQ0LPcyE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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