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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae445956cb7056509f68749a3330787b639cc3085345f1b71b34adfb882cb71c' 
  AND token = 'T3dfVXn6DEvIhsuHlPwA7aiYIr32k4aSj2U/F0mm1Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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