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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = 'b61065cd2d9dae68f9a35227911b24a7c8e0a0970f2eec11ededef77b8bd9c0b' 
  AND token = 'VDQED6ynjoSSZOs67gYEZYzn5DvMRraIzALnja5mMgg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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