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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3d51bd7e587e07f91e12413f1fad30a386dac1f722695294a18a3ca76381be2a' 
  AND token = 'Vcdsr5Ca58v0uVcz4v2F/bBLTxbZJ7s/rnU75Q49gAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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