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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '4e8fd6e54780e1a5a65c021fa62570dffdca30db7c1ff564a2320d0bde3a5b36' 
  AND token = 'QMOy0Ve3CYpUxxZlEC3GmQz7c+1SODaLZe/5nwH9Fgo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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