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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'ae6eeffb9919a3417888a3daaf4416fa070fb16999d7dc8e3925d918f1c75097' 
  AND token = 'zx3A3r6woMqC/Avq23SakpP4Y+rloiQCvSCwX3jaTWE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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