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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '129a91ef3a0f1f68f5b108d8f67acc814623448b2be583554459cced3e84654e' 
  AND token = 'mYaQqb+70NUelphtC+daC+gzAsbG3P51KWsmWs9B5fo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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