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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '97f19f6bec21fa8bd4b844adfe189f020cf0d858d271a87e649e1877fed479e7' 
  AND token = 'FV0LVOjteZ7iRNJfb7YIVhiMFtr+/h98euUnOmJJpH4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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