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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'efb68561cb3f7586407d2e8c92b71c2544aaa05c42738c2686c6e55d90a05525' 
  AND token = 'an6J9SDqHw+f3wneIBtokWaJqaenxj5TlTyj2inChnM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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