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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '9c922de112e92b8ee46f3cc237d123b11da38c82f3190b11bb1af765fe9808b2' 
  AND token = '7JBdQ1VXLD0rQajX79YHr/TFjvxWGCrxjyzEjiOYLig=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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