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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '36cdb45c45ca6c8389e4de54a71d1aff0c934cbacf9fb08f85edcc5b90aa78c5' 
  AND token = 'LAKeP0DvsqDtDJzsjiMXC/YGK6GxeXA6PLCw7kqLwmI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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