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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ed659858ae396ce67e9093719450118c7d3967330a265a8331a1e8bfdfcc4b11' 
  AND token = 'klKhKHmlegnUmRFrxsODjFu8yS6w7barCDb8RRncUaw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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