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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3e2be35e20fbabe9561eb8be3826d55499e544b2a8a6caf85bde84f217fb2c96' 
  AND token = 'Y/V6lQtZZGWAdizTbgazFIxQocBR4lEZIcVQ6ybE9xg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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