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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b0e7ae850186359963d7d97199a8fbdc7277c23065e1021bb7ce7bd0e5ee6341' 
  AND token = 'iwfk9PYqfHZn/FcrLIW9HWowOffkTnkkS/xVfc94a5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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