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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'a043001e3ff02eff07be8b569faa3c0ae15f27631fe67bd85196fe09ab635286' 
  AND token = '4Kuu5WKJzrSazr+94i9tmnRhgshaA24swSmK3Oi8aCc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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