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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '3df5ce3d777e666467022636a3443a4fadc5e3e5682e428e255f94ba4a2b8ba6' 
  AND token = 'BDKBT8etI7Fz1OpYORcBHb3kwySTANlJGDAq6Jz+tGM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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