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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '707e357f128eed003a7d7d4ee035fb73770be914759b7cdc8ee77cb8050c4331' 
  AND token = 'Xf8L9Je6lQb0TjpwwMPXcs+wzCHc9MXObz+9QOI4QuI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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