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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8dc4ee040db97bc8c5bcf45e6b5f86245bd49d39121af841e6e573f5b4ad94ab' 
  AND token = 'eCF15FxiBhlcEdTAH/PgSOEdyb6pmJ1W0bTQbLb7GOI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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