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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '74fd25956d6a3ad8c096b85ec715b03f624be6718670a5cc9994ff52cbbac008' 
  AND token = 'va4mal1gxECZ7iX8iH7TvaD/HlbwQIupnbei/MN6tuk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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