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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'f20c37eb7bb3b050a9b0925a9e4aa9c1f42d53046e198bd6d651e938c1089777' 
  AND token = 'BuUGLho8YQ7ruChsTVcrcwy0zVefr1xB1W5iVCmISpI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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