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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d8b40bbfb3836360af9b0c10308b687c4ac135c89996ee5ce8f1c29512d2d88' 
  AND token = '6FwF73ev09vov52mqxv628iG9QUGkkyFJEMX70AbTzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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