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SELECT 
  1 
FROM 
  cscart_aprillock_keys 
WHERE 
  key_id = '06b14af3e1de2d0de6dd9c0fdf004b4325c771940c6187164c586c28089dd909' 
  AND token = 'yocEeKk6Pb7Xrdz0wHqHNu8Yh/aZTc2CiI7iC5GUTKQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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