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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '094ca15dbf5c270e72220fc66d8f1978c0c6989e6e6fd0e5bc169cf9acd052bf' 
  AND token = 'q9CNGRuW9Ra/GKO51d9LmdnI/AFhkAJOMaQuCcTm1lc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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