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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a8bdfb0255f8feeb74254e94cae7f3a0993b7fa1f1ffc2adfadb7e671db96afc' 
  AND token = '0BluTi2SlJWTmRdL4QSTD+OWpY4VOq4MZdEhhIWkMYc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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