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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '8d061bcc19bd3d26eb2d112f0e700d21a9ea0f94912ad0d7933aa3ea5f7c9fe4' 
  AND token = 'v6O3qhWBLiy2BvXMgvCWcZf89HZhTVZPRi2gMnwyE6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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