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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '02571647377c46e56baedde1c7261a53175b5e6f3697e56dcd25a9d68bf74514' 
  AND token = 'MEw7qQ7lqFQv3+RGk2nT69OPKO5keKDN/rhfH/tKGYk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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