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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'eda92f62aa57b0ecffb56ac7ecf2dce091cdf9f0462ee5d644c7ac1c169631d5' 
  AND token = 'q7TV14nmPckfPff8m9UTL6tMn55VEK8v6HyrzO1uuI8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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